“…The lack of effective results and cross‐over effect may be because young children's health behaviour is primarily directed by their parents, as children are unlikely to have the required capability and control over their own behaviours in the home (Cooper et al ., ; Hamilton, Cleary, White, & Hawkes, ). Considering dental decay is preventable (WHO, ) and children's heath is influenced by their parents behaviour (Hamilton, Spinks, White, Kavanagh, & Walsh, ; Hamilton, Cleary, et al ., ; Hamilton, Kirkpatrick, Rebar, White, & Hagger, 2017; Thomson, White, & Hamilton, ), including toothbrushing behaviours (Marshman et al ., ; Trubey, Moore, & Chestnutt, ), research is needed into the psychological processes that guide parents’ behaviour for their young children's toothbrushing behaviours to combat oral ill health in the early years (see Gray‐Burrows, Owen, & Day, ; Gray‐Burrows et al ., ). Indeed, a recent systematic review suggested a need for further prospective and experimental studies examining a range of psychological factors in relation to oral health behaviours (Scheerman et al ., ).…”